A font is a specific style and size of text characters used in printed or digital media. It includes letters, numbers, and symbols, all designed to convey information visually. Fonts can vary widely in appearance, from formal styles like Times New Roman to more casual ones like Comic Sans. Fonts are categorized into families, such as serif and sans-serif. Serif fonts have small lines or decorations at the ends of their letters, while sans-serif fonts do not. Choosing the right font is important for readability and can influence the tone of the message being communicated.